package net.mysoft.budgetsoft.system.security;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;

/**
 * 
 *
 * Description: 一个自定义的filter， 
 *  必须包含authenticationManager,accessDecisionManager,securityMetadataSource三个属性， 
 *  我们的所有控制将在这三个类中实现 
 *
 * @author kangrui
 * @version 1.0
 * <pre>
 * Modification History: 
 * Date         Author      Version     Description 
 * ------------------------------------------------------------------ 
 * 2013-12-19    kangrui       1.0        1.0 Version 
 * </pre>
 */
public class SecurityFilter extends AbstractSecurityInterceptor implements Filter{
	
	private FilterInvocationSecurityMetadataSource securitySourceService;
	
	public void setSecuritySourceService(
			FilterInvocationSecurityMetadataSource securitySourceService) {
		this.securitySourceService = securitySourceService;
	}

	@Override
	public Class<?> getSecureObjectClass() {
		return FilterInvocation.class;
	}

	@Override
	public SecurityMetadataSource obtainSecurityMetadataSource() {
		// TODO Auto-generated method stub
		return securitySourceService;
	}

	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		FilterInvocation fi = new FilterInvocation( request, response, chain );
		invoke(fi);
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}
	
	public void invoke(FilterInvocation fi) throws IOException, ServletException{
		InterceptorStatusToken token = super.beforeInvocation(fi);
		try{
			fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
		}finally{
			super.afterInvocation(token, null);
		}
	}

}
